Avoid missing argument description warnings when loading GRASS layers

src/providers/grass/qgis.g.info.c

@@ -57,39 +57,48 @@ int main( int argc, char **argv )
 
   rast_opt = G_define_standard_option( G_OPT_R_INPUT );
   rast_opt->key = "rast";
+  rast_opt->description = "rast";
   rast_opt->required = NO;
 
   vect_opt = G_define_standard_option( G_OPT_V_INPUT );
   vect_opt->key = "vect";
+  vect_opt->description = "vect";
   vect_opt->required = NO;
 
   coor_opt = G_define_option();
   coor_opt->key = "coor";
+  coor_opt->description = "coor";
   coor_opt->type = TYPE_DOUBLE;
   coor_opt->multiple = YES;
 
   north_opt = G_define_option();
   north_opt->key = "north";
+  north_opt->description = "north";
   north_opt->type = TYPE_STRING;
 
   south_opt = G_define_option();
   south_opt->key = "south";
+  south_opt->description = "south";
   south_opt->type = TYPE_STRING;
 
   east_opt = G_define_option();
   east_opt->key = "east";
+  east_opt->description = "east";
   east_opt->type = TYPE_STRING;
 
   west_opt = G_define_option();
   west_opt->key = "west";
+  west_opt->description = "west";
   west_opt->type = TYPE_STRING;
 
   rows_opt = G_define_option();
   rows_opt->key = "rows";
+  rows_opt->description = "rows";
   rows_opt->type = TYPE_INTEGER;
 
   cols_opt = G_define_option();
   cols_opt->key = "cols";
+  cols_opt->description = "cols";
   cols_opt->type = TYPE_INTEGER;
 
   if ( G_parser( argc, argv ) )